Device for bending pipe



2 Sheets-Sheet 1.

(No Model.)

E. o. DANIELS.

' DEVICE FOR-BENDING PIPE;

166.669,1666 1366611666 Aug. 66, 1667.

IKN T0117 WMO' w@ '4mm (No Model.) E. 0. DANIELS.

DEVICE EUR BENDING PIPE', ,l Y No. 369,166. j Patented Aug., 30, 1887.

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, 2 sheets-sheet 2. l

l UNITED STATES PATENT OFFICE.

EUGENE ORA DANIELS,

OF SPRINGFIELD, OHIO.

DEVICE FOR BENDING PIPE.

SPECIFICATION forming part of Letters Patent No. 369,166, dated August 30, 1887.

- Application flied April Q5, 1887. sel-inl No. 235,074. (N model.)

To all whom it Hwy concern:

Bc it known that I, EUGENE ORA DANIELs, a citizen of theUnited States,residing at Springeld, in the county of Clark and State of Ohio, have invented certain new and useful Improvements in Devices for Bending Pipe, of which the following is a specification, reference being had therein to the accompanying'drawings.

This invention relates to improvements in pipe-bending tools, and the principal object in View is to bend pipes without crimping or cracking the inner periphery of the bend and vitlout flattening the outer periphery of the The tool consists, essentially, of a bar curved at one end through the are of a circle and having a groove in the outer face thereof, and of a lever axially mounted with respect to the curve of the said bar and carrying a bendingblock having a groove therein opposite tothe groove in the bar, the said grooves together forming an ellipse, an oval, or a circle.

In the accompanying drawings, forming a part of this specification, and on which simi'- lar letters of reference indicate the same or corresponding features, Figure 1 represents a plan view of nly improved tool with a portion broken away; Fig. 2, a like view of a portion thereof, showing the oval form of groove;

Fig'. 3, respectively sectional and end views of the bending-block, Fig. 4, a plan view of the block and a portion of the bar on a larger scale than in Fig. l; Fig. 5, alike view to Fig.

4, save that the groove is circular; a side elevation of the tool entire.

The letter A refers to a metallic bar, which constitutes the former, one end of which is curved in the are of a circle extending through, say, ninety degrees. In the outer face of the bar is formed a longitudinal groove, the crosssection whereof constitutes a portion of an ellipse or of an oval or of acircle. Projecting from the bar are arms B, which nleet and form a fulcruin for the pivot-pill C, upon which the and Fig. 6,

hand-lever D is mounted. This lever is of a suitable length to afford ample leverage to operate the bendingblock, presently to be described. The shorter end of the lever is divided, as clearly seen in Fig. 1, and stands to either side of the bar A. A link, E, is pivotally connected at F with one member ofthe .divided portion of the lever. The other side of the link is provided with a lug, G, in which is pivotally mounted a locking-bolt,H, having a thlllnb or other nut, I. A bifurcated lug, J, extends from the adjacent member of the divided portion of the lever, and into it is swung said bolt, when, upon turning the nut, the link is firmly united with the lever. Upon loosening the nut the bolt may be swung out of the bifurcation in the lug J, and the link swung on its pivot F, so as to facilitate the insertion and the removal of a pipe for and after bendincl.

z:A bolt, K, is passed through the link E, and upon it is mounted the bending-block, the

same being constructed of hardened steel, and

having agroove of the peculiar character presently to be mentioned.

A'screw, M, passes through the end of the link and enters a recess, N, (see Fig. 3,) in the block L, whereby the block is prevented from turning on the bolt K, and whereby it is adjusted nearer to the bar as occasion may require, the hole through which the bolt K passes being of slotted ferm when it is desired to render it capable of adjustment, as suggested in dottedlines in Fig. 3. In any event the bolt K and the screw M sustain the block.

The groove in the plug may be either a partial ellipse, a partial oval, or a partial circle, the remaining portion of these several figures or shapes being completed by the groove in the bar; but the greater portion of the groove,

whatever be its shape in cross-section, should be in the block, for the purpose ot' giving the block as much frictional contact with the pipe as is practicable, so as to cause it to draw upon the outer periphery of the bend and to stretch the metal as much as possible to compensate for the increased length of said periphery over the same amount of pipe when in a straight line. The groove at its base O forms a curve, opposite to the curve in the bar, so as to keep the ends of the groove clear of the pipe to prevent cutting. The sides ofthe groove are also curved inwardly and toward each other for the same purpose, giving the groove a Haring entrance in each direction.

Vhen a pipe is inserted, as seen in Fig. 6, and the longer end ofthe lever moved toward the straight portion of the bar A, the block L will travel around the bend in the bar and IOO force the pipe against said bar and give it a curve. This bends the pipe, but leaves the outer periphery slightly flattened in cross-section; but upon reversing the lever and moving the block back in the opposite direction this slight flattening of the pipeis removed and the pipe left of practically circular form in crosssection. The irst engagement of the block with the pipe as the lever sweeps around accomplishes, essentially, the bending of the pipe, while the reverse movement above alluded to causes an engagement of the pipe by the block principally at the sides of the pipe, bulging it at the slightlylattened portion, and bringing it practically back to its circular form. This I have ascertained in the use of the tool. Of the several forms of grooves I prefer the elliptical.

I am aware that pipe-bending tools have 2o heretofore been made in which a curved forming-bar and a lever with a wheel or surface to engage the pipe have been used; but I am not aware that any one has heretofore so constructed the pipe-engaging portion carried by the lever that it will frictionally engage the pipe in such a manner as to draw out and lengthen it along the outer periphery.

The clamping device shown in connection with the bar A is of the character shown and described in Letters Patent granted to me for improvements in pipe bending tools, No. 361,398, April 19, 1887.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a pipe-bending tool, the combination, with a bar having one end curved and having a groove in the outer face thereof and arms projecting from the bar, of a lever pivoted to said arms axially to the bend in the bar and a bending-block carried by said lever and having a groove opposite the groove in the bar, and arranged to bend a pipe and' somewhat draw out the same when the lever is,

actuated.

2. In a pipe-bending tool, the combination7 with the bar having one end curved and grooved in the outer face thereof; a clamping device, and arms extending from the bar, of a lever pivoted to the arms axially to the bend in the bar and a bending-block carried by said lever and having a groove of greater depth than the groove in the bar and placed opposite the'latter, for the purpose set forth.

3. In a pipe-bending tool, the combination, with a bar curved at one end and having a groove in the outer face thereof, a clamping device, and arms extending from the bar, of alever pivoted to the arms axially to the said curve in the bar and having a groove of greater depth than the groove in the bar and whose ends are flaring.

i 4. In a pipe-bending tool, the combination, with a bar curved at one end and having a groove in the outer face thereof, a clamping device, and arms extending therefrom, of a 1ever pivoted to said arms axially to the curve in the bar, a link pivoted to the lever at one side and a fastening device at the other side, and a bending-block carried by the link and having a groove therein opposite the groove in the bar.

5. In a pipe-bending tool, the combination, with a bar curved at one end and having a groove in the outer face, a clamping device, and arms 'extending from the bar, of a lever pivoted to'said arms axially to the said curve, a link pivoted to the shorter end of the lever at one side and having a Afastening device at the other side, and a bending-block mounted in the link and having a groove of greater depth than the groove in the bar.

6. In a pipe-bending tool, the combination, with a pivoted lever and a link pivoted thereto and at one side and having a fastening device at the other, of a bending-block mounted in the link and having a groove therein which is deeper than one-half the shape or figure of which the groove represents a part.

7. In a pipe-bending tool, a bending-block having a groove therein which is deeper than one-half the shape or figure of which the groove represents a part.

8. In a pipe-bending tool, a bending-block having a groove therein which is deeper than one-half the shape or figure of which the groove represents a part, and flared from the middle outward.

9. In a pipe-bending tool, the combination, with a formingbar having a groove, of a pivoted lever, and a bending-block carried by the lever' and having a groove, the two grooves being coincident and lforming a geometrical figure, the greater portion whereof is in the block.

In testimony whereof I afiix my signature in presence of two witnesses.

EUGENE ORA DANIELS.

IVitnesscs:

WiLnUR GoLvrN, A. A. Yim'rimN.

IOO 

